厳しい環境条件での光ファイバ曲がり部信頼性の推定法

概要

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Nowadays, bend-insensitive silica optical fibers are innovating on optical fiber access networks and applications. However the radical decrease of the bending radius may cause delayed failure of the fibers when they are used in harsh environments, because the conventional theories to estimate the mechanical reliability of the bent portion are not applicable to such environments. Though one of the authors has driven an enhanced equation applicable to the fibers in high temperature and/or high humidity environments, the equation is not easy to evaluate because it requires numerical integration. We propose another simpler equation that we have driven from commonly-used conventional equations. Calculations for specific conditions were carried out using the parameters extracted from an empirical formula. It was found that the new equation can be much improved in precision by applying a correction coefficient to the proof test parameter in the equation. Accordingly, the reliability calculation can be easily carried out without numerical integration.